78421714 has 16 divisors (see below), whose sum is σ = 142345728. Its totient is φ = 31632192.

The previous prime is 78421669. The next prime is 78421757. The reversal of 78421714 is 41712487.

It is a super-2 number, since 2×78421714² = 12299930453395592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 78421714.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164514 + ... + 164989.

It is an arithmetic number, because the mean of its divisors is an integer number (8896608).

Almost surely, 2^78421714 is an apocalyptic number.

78421714 is a deficient number, since it is larger than the sum of its proper divisors (63924014).

78421714 is a wasteful number, since it uses less digits than its factorization.

78421714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329529.

The product of its digits is 12544, while the sum is 34.

The square root of 78421714 is about 8855.6035367444. The cubic root of 78421714 is about 428.0345016878.

The spelling of 78421714 in words is "seventy-eight million, four hundred twenty-one thousand, seven hundred fourteen".